Drop remaining Python < 3.8 support (#44743)

Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io>
Co-authored-by: Franck Nijhof <git@frenck.dev>

.pre-commit-config.yaml

@@ -3,7 +3,7 @@ repos:
     rev: v2.7.2
     hooks:
       - id: pyupgrade
-        args: [--py37-plus]
+        args: [--py38-plus]
   - repo: https://github.com/psf/black
     rev: 20.8b1
     hooks:

.readthedocs.yml

@@ -4,7 +4,7 @@ build:
   image: latest
 
 python:
-  version: 3.7
+  version: 3.8
   setup_py_install: true
 
 requirements_file: requirements_docs.txt

azure-pipelines-release.yml

@@ -60,9 +60,9 @@ stages:
       vmImage: 'ubuntu-latest'
     steps:
     - task: UsePythonVersion@0
-      displayName: 'Use Python 3.7'
+      displayName: 'Use Python 3.8'
       inputs:
-        versionSpec: '3.7'
+        versionSpec: '3.8'
     - script: pip install twine wheel
       displayName: 'Install tools'
     - script: python setup.py sdist bdist_wheel

azure-pipelines-translation.yml

@@ -30,9 +30,9 @@ jobs:
     vmImage: 'ubuntu-latest'
   steps:
   - task: UsePythonVersion@0
-    displayName: 'Use Python 3.7'
+    displayName: 'Use Python 3.8'
     inputs:
-      versionSpec: '3.7'
+      versionSpec: '3.8'
   - script: |
       export LOKALISE_TOKEN="$(lokaliseToken)"
       export AZURE_BRANCH="$(Build.SourceBranchName)"

homeassistant/bootstrap.py

@@ -307,12 +307,10 @@ def async_enable_logging(
     sys.excepthook = lambda *args: logging.getLogger(None).exception(
         "Uncaught exception", exc_info=args  # type: ignore
     )
-
-    if sys.version_info[:2] >= (3, 8):
-        threading.excepthook = lambda args: logging.getLogger(None).exception(
-            "Uncaught thread exception",
-            exc_info=(args.exc_type, args.exc_value, args.exc_traceback),
-        )
+    threading.excepthook = lambda args: logging.getLogger(None).exception(
+        "Uncaught thread exception",
+        exc_info=(args.exc_type, args.exc_value, args.exc_traceback),  # type: ignore[arg-type]
+    )
 
     # Log errors to a file if we have write access to file or config dir
     if log_file is None:

homeassistant/core.py

@@ -73,7 +73,6 @@ from homeassistant.exceptions import (
 from homeassistant.util import location, network
 from homeassistant.util.async_ import fire_coroutine_threadsafe, run_callback_threadsafe
 import homeassistant.util.dt as dt_util
-from homeassistant.util.thread import fix_threading_exception_logging
 from homeassistant.util.timeout import TimeoutManager
 from homeassistant.util.unit_system import IMPERIAL_SYSTEM, METRIC_SYSTEM, UnitSystem
 import homeassistant.util.uuid as uuid_util
@@ -86,7 +85,6 @@ if TYPE_CHECKING:
 
 
 block_async_io.enable()
-fix_threading_exception_logging()
 
 T = TypeVar("T")
 _UNDEF: dict = {}  # Internal; not helpers.typing.UNDEFINED due to circular dependency

homeassistant/package_constraints.txt

@@ -15,7 +15,6 @@ emoji==0.5.4
 hass-nabucasa==0.39.0
 home-assistant-frontend==20201229.0
 httpx==0.16.1
-importlib-metadata==1.6.0;python_version<'3.8'
 jinja2>=2.11.2
 netdisco==2.8.2
 paho-mqtt==1.5.1

homeassistant/runner.py

@@ -3,7 +3,6 @@ import asyncio
 from concurrent.futures import ThreadPoolExecutor
 import dataclasses
 import logging
-import sys
 from typing import Any, Dict, Optional
 
 from homeassistant import bootstrap
@@ -41,14 +40,7 @@ class RuntimeConfig:
     open_ui: bool = False
 
 
-# In Python 3.8+ proactor policy is the default on Windows
-if sys.platform == "win32" and sys.version_info[:2] < (3, 8):
-    PolicyBase = asyncio.WindowsProactorEventLoopPolicy
-else:
-    PolicyBase = asyncio.DefaultEventLoopPolicy
-
-
-class HassEventLoopPolicy(PolicyBase):  # type: ignore
+class HassEventLoopPolicy(asyncio.DefaultEventLoopPolicy):  # type: ignore[valid-type,misc]
     """Event loop policy for Home Assistant."""
 
     def __init__(self, debug: bool) -> None:

homeassistant/util/package.py

@@ -1,5 +1,6 @@
 """Helpers to install PyPi packages."""
 import asyncio
+from importlib.metadata import PackageNotFoundError, version
 import logging
 import os
 from pathlib import Path
@@ -10,17 +11,6 @@ from urllib.parse import urlparse
 
 import pkg_resources
 
-if sys.version_info[:2] >= (3, 8):
-    from importlib.metadata import (  # pylint: disable=no-name-in-module,import-error
-        PackageNotFoundError,
-        version,
-    )
-else:
-    from importlib_metadata import (  # pylint: disable=import-error
-        PackageNotFoundError,
-        version,
-    )
-
 _LOGGER = logging.getLogger(__name__)
 
 

homeassistant/util/thread.py

@@ -1,33 +1,10 @@
 """Threading util helpers."""
 import ctypes
 import inspect
-import sys
 import threading
 from typing import Any
 
 
-def fix_threading_exception_logging() -> None:
-    """Fix threads passing uncaught exceptions to our exception hook.
-
-    https://bugs.python.org/issue1230540
-    Fixed in Python 3.8.
-    """
-    if sys.version_info[:2] >= (3, 8):
-        return
-
-    run_old = threading.Thread.run
-
-    def run(*args: Any, **kwargs: Any) -> None:
-        try:
-            run_old(*args, **kwargs)
-        except (KeyboardInterrupt, SystemExit):  # pylint: disable=try-except-raise
-            raise
-        except Exception:  # pylint: disable=broad-except
-            sys.excepthook(*sys.exc_info())
-
-    threading.Thread.run = run  # type: ignore
-
-
 def _async_raise(tid: int, exctype: Any) -> None:
     """Raise an exception in the threads with id tid."""
     if not inspect.isclass(exctype):

pyproject.toml

@@ -1,5 +1,5 @@
 [tool.black]
-target-version = ["py37", "py38"]
+target-version = ["py38"]
 exclude = 'generated'
 
 [tool.isort]

requirements.txt

@@ -9,7 +9,6 @@ bcrypt==3.1.7
 certifi>=2020.12.5
 ciso8601==2.1.3
 httpx==0.16.1
-importlib-metadata==1.6.0;python_version<'3.8'
 jinja2>=2.11.2
 PyJWT==1.7.1
 cryptography==3.2

setup.cfg

@@ -11,7 +11,8 @@ classifier =
     Intended Audience :: Developers
     License :: OSI Approved :: Apache Software License
     Operating System :: OS Independent
-    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
     Topic :: Home Automation
 
 [flake8]
@@ -31,7 +32,7 @@ ignore =
     W504
 
 [mypy]
-python_version = 3.7
+python_version = 3.8
 show_error_codes = true
 ignore_errors = true
 follow_imports = silent

setup.py

@@ -40,7 +40,6 @@ REQUIRES = [
     "certifi>=2020.12.5",
     "ciso8601==2.1.3",
     "httpx==0.16.1",
-    "importlib-metadata==1.6.0;python_version<'3.8'",
     "jinja2>=2.11.2",
     "PyJWT==1.7.1",
     # PyJWT has loose dependency. We want the latest one.

tests/components/plex/mock_classes.py

@@ -247,7 +247,7 @@ class MockPlexServer:
         """Mock the playlist lookup method."""
         return MockPlexMediaItem(playlist, mediatype="playlist")
 
-    @lru_cache()
+    @lru_cache
     def playlists(self):
         """Mock the playlists lookup method with a lazy init."""
         return [

tests/components/webostv/test_media_player.py

@@ -1,5 +1,6 @@
 """The tests for the LG webOS media player platform."""
-import sys
+
+from unittest.mock import patch
 
 import pytest
 
@@ -25,12 +26,6 @@ from homeassistant.const import (
 )
 from homeassistant.setup import async_setup_component
 
-if sys.version_info >= (3, 8, 0):
-    from unittest.mock import patch
-else:
-    from unittest.mock import patch
-
-
 NAME = "fake"
 ENTITY_ID = f"{media_player.DOMAIN}.{NAME}"
 

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py37, py38, lint, pylint, typing, cov
+envlist = py38, py39, lint, pylint, typing, cov
 skip_missing_interpreters = True
 ignore_basepython_conflict = True